A passenger aboard an Air Canada flight from Toronto to Dubai opened a cabin door before takeoff on Monday evening, injuring themselves and causing lengthy delays.
Didn't Douglas Adams write a bit around that in one of his books? It says, "Warning: Do not look into laser with remaining eyeball," or something to that effect?
I think that joke's been around for a while, but there is the Terry Pratchett line about how if you had a button with a sign next to it saying "pressing this button will end the world, do not touch," the ink wouldn't even have time to dry.